you could use client_putinserver() which is called _after_ client_connect()...
Also, you could use a set_task() to delay the printing of your text a few seconds..
Code:
// -cLuBz-
#include <amxmodx>
#define TASK_ID 1234
public plugin_init() {
register_plugin("Test","0.00","cLuBz")
}
public client_putinserver(id) {
new sid[2]
sid[0] = id
// Show text in 3.0 seconds..
set_task( 3.0, "ShowText", TASK_ID, sid, 1 )
}
public ShowText( args[] ) {
new id = sid[0]
client_print(id,print_chat,"Test")
}